Andrew Zeff Andrew R. Zeff (Chicago, IL) is Vice President of Zeff Training and Consulting (ZTAC, Inc.), a Microsoft Technical EducationCenter. He has over 12 years of experience as a network administrator, engineer, and Microsoft Certified Trainer. He is alo a Certified Novell Instructor. He is the author of iNet+ All-in-One Certification Exam Guide. Read More Read Less